降雨能使火烧迹地的土壤密度和分散系数升高、孔隙度下降。
Rainfall makes the soil density and disperse coefficient increased and porosity decreased.
大量实验表明：当油藏生产原油时，随着地层中流体压力的降低，油层的孔隙度和渗透率下降，特别是在异常高压油藏中尤为显著。
Many experiments show that: when a well produces oil from a reservoir, the porosity and permeability will decrease, as fluid pressure drops, especially for reservoirs with abnormal high pressure.
试验结果表明该类岩心的孔隙度和渗透率随压力增大呈近指数规律下降。
It is concluded that porosity and permeability of the core are declined with the increase of pressure.
与常规水作相比，覆膜旱作稻田土壤容重有所下降，总孔隙度增加显著；
The results were as follows:Compared with conventional flooded paddy soils, rain fed and mulching plastic film slightly reduced bulk density, increased total porosity of the soils.
采用U_3O_8添加剂可改善芯块微观结构，但同时使芯块密度下降，开口孔隙度增加进而导致吸湿加剧。
The use of U3O8 additive can improve the pellet microstructure, but result in decrease of pellet density and increase of open porosity, which contributes strongly to moisture.
连年火烧使土壤密度比未烧林地下降，而孔隙度和分散系数升高。
The soil density is decreased, and the disperse coefficient and porosity are increased in the sites where were burnt in successive years.
加固区内地基中的孔隙水压力的最大消散值可分为两个组成部分：一为真空度的直接传递导致的孔压下降值；二为抽真空引起水位线下降进而引起的孔压消散值。
The value of pore water pressure dissipation can be divided into two parts. One part is produced by vacuum degree and the other part by groundwater table lowering.
加固区内地基中的孔隙水压力的最大消散值可分为两个组成部分：一为真空度的直接传递导致的孔压下降值；二为抽真空引起水位线下降进而引起的孔压消散值。
The value of pore water pressure dissipation can be divided into two parts. One part is produced by vacuum degree and the other part by groundwater table lowering.
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